Merge pull request #3 from ChrisBoesch/master

update
Merge pull request #366 from LI-HE/master

changed practice game display logic to show player's paths instead of default all
Merge pull request #367 from ruijunhuang2010/master

Merge pull request #3 from ChrisBoesch/master
Merge pull request #4 from ChrisBoesch/master

update
Merge pull request #368 from LI-HE/master

debug for previous commit
Merge pull request #116 from ChrisBoesch/master

Updates
minor edit to check for registration #2
Merge pull request #369 from ShaikDawood/master

minor edit to check for registration bug #2
Challenge Registration bug fix
Merge pull request #370 from ShaikDawood/master

Challenge Registration bug fix
Merge pull request #371 from ruijunhuang2010/master

Merge pull request #4 from ChrisBoesch/master
Merge pull request #20 from ChrisBoesch/master

update